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Sorry, we can't help since we don't have any pictures or instructions for your pattern. Perhaps searching the internet for now to sew on patch pockets will yield some assistance. Or look for a basic sewing manual at the local library.

Sounds like a thread jam in your bobbin area probably from the thread getting caught. Once you find the caught thread you'll need to give it all a bit of a clean and oil here's an aritcle that might help. http://ginascraftcorner.blogspot.com/2014/09/love-your-machine-and-it-will-love-you.html

If your thread is getting caught underneath it's usually the UPPER thread is threaded wrong or not correctly through the tension discs. This can also happen if you're using Sticky Back stabilizer. Make sure you have a new needle in case there's a burr on the old one which can also cause this problem.

I would try embroidering on a scrap of like material to get the tension you want. My Brother (different model) manual doesn't say any specific tension setting for embroidering but just says to set the tension right for the fabric to be worked. If the fabric is stretchy, I suggest using a little looser tension than say cotton, just make sure it doesn't pucker the fabric.

No it is not possible. If you invent a hoop to do this you will become richer than Bill Gates. When you want to do embroidery on a pocket, you have to remove the pocket first, do the embroidery and stitch the pocketback onto the shirt.